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Date:   Tue, 13 Jun 2023 16:58:25 +0100
From:   Catalin Marinas <catalin.marinas@arm.com>
To:     Stephen Rothwell <sfr@canb.auug.org.au>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Next Mailing List <linux-next@vger.kernel.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        PowerPC <linuxppc-dev@lists.ozlabs.org>
Subject: Re: linux-next: build failure after merge of the mm tree
Message-ID: <ZIiSITqP1cXkR8Uz@arm.com>
References: <20230613162119.4a7a7d3c@canb.auug.org.au>
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Hi Stephen,

On Tue, Jun 13, 2023 at 04:21:19PM +1000, Stephen Rothwell wrote:
> After merging the mm tree, today's linux-next build (powerpc
> ppc44x_defconfig) failed like this:
> 
> In file included from arch/powerpc/include/asm/page.h:247,
>                  from arch/powerpc/include/asm/thread_info.h:13,
>                  from include/linux/thread_info.h:60,
>                  from include/asm-generic/preempt.h:5,
>                  from ./arch/powerpc/include/generated/asm/preempt.h:1,
>                  from include/linux/preempt.h:78,
>                  from include/linux/spinlock.h:56,
>                  from include/linux/ipc.h:5,
>                  from include/uapi/linux/sem.h:5,
>                  from include/linux/sem.h:5,
>                  from include/linux/compat.h:14,
>                  from arch/powerpc/kernel/asm-offsets.c:12:
> arch/powerpc/include/asm/page_32.h:16: warning: "ARCH_DMA_MINALIGN" redefined
>    16 | #define ARCH_DMA_MINALIGN       L1_CACHE_BYTES
>       | 
> In file included from include/linux/time.h:5,
>                  from include/linux/compat.h:10:
> include/linux/cache.h:104: note: this is the location of the previous definition
>   104 | #define ARCH_DMA_MINALIGN __alignof__(unsigned long long)
>       | 
> 
> (lots of theses)
> 
> Caused by commit
> 
>   cc7335787e73 ("mm/slab: decouple ARCH_KMALLOC_MINALIGN from ARCH_DMA_MINALIGN")
> 
> I have applied the following hack for today - we need something better.

I just posted this series fixing it for powerpc, microblaze and sh. I
did not add the #ifndef __powerpc64__ line since
CONFIG_NOT_COHERENT_CACHE should not be enabled for those builds.

https://lore.kernel.org/r/20230613155245.1228274-1-catalin.marinas@arm.com

> From: Stephen Rothwell <sfr@canb.auug.org.au>
> Date: Tue, 13 Jun 2023 16:07:16 +1000
> Subject: [PATCH] fix up for "mm/slab: decouple ARCH_KMALLOC_MINALIGN from ARCH_DMA_MINALIGN"
> 
> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
> ---
>  arch/powerpc/include/asm/cache.h | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/arch/powerpc/include/asm/cache.h b/arch/powerpc/include/asm/cache.h
> index ae0a68a838e8..e9be1396dfd1 100644
> --- a/arch/powerpc/include/asm/cache.h
> +++ b/arch/powerpc/include/asm/cache.h
> @@ -142,5 +142,14 @@ static inline void iccci(void *addr)
>  }
>  
>  #endif /* !__ASSEMBLY__ */
> +
> +#ifndef __powerpc64__
> +#ifdef CONFIG_NOT_COHERENT_CACHE
> +#ifndef ARCH_DMA_MINALIGN
> +#define ARCH_DMA_MINALIGN	L1_CACHE_BYTES
> +#endif
> +#endif
> +#endif
> +
>  #endif /* __KERNEL__ */
>  #endif /* _ASM_POWERPC_CACHE_H */

I think it should also remove the ARCH_DMA_MINALIGN from asm/page.h (as
I did in my series; sorry I did not cc you, only noticed now that you
reported it as well).

-- 
Catalin